Machine element or mechanism – Gearing – Interchangeably locked
Patent
1995-07-27
1997-10-14
Wright, Dirk
Machine element or mechanism
Gearing
Interchangeably locked
74745, 477908, B60K 4108, F16H 5908
Patent
active
056760175
ABSTRACT:
A system for automatically effecting a range shift between high and low ranges in a multi-speed transmission includes a control that monitors the output speed of both the engine and the transmission. The ratio of the two speeds is compared to available ratios in a look-up table such that the control is constantly determining the engaged gear. In one embodiment, a driver provides an intention of the next gear to be selected to the control. Should the intended gear shift require a range shift from thee engaged gear, the control actuates the range shift once the transmission has been moved to neutral. In a second embodiment, no driver intention is provided to the controller. Instead, the control compares the engine output speed to threshold values. If the threshold values predict a gear shift that would require a range shift to be effected from the currently engaged gear, then the range shift will be effected once the transmission has been moved to neutral.
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Allen, Jr. Charles E.
Desautels Thomas
Huber Jon M.
Palmeri Frank A.
Rockwell Heavy Vehicle Systems, Inc.
Wright Dirk
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